Optical modulation system for an image display

(19)

(11)

EP 0 749 106 A3

(12)	EUROPEAN PATENT APPLICATION

(88)	Date of publication A3:
	05.02.1997 Bulletin 1997/06

(43)	Date of publication A2:
	18.12.1996 Bulletin 1996/51

(21)	Application number: 96304468.0

(22)	Date of filing: 14.06.1996

(51)	International Patent Classification (IPC)⁶: G09G 3/34, G09G 3/36

(84)	Designated Contracting States:
	DE ES FR GB IT NL SE

(30)

Priority:

15.06.1995 JP 148793/95
16.06.1995 JP 150280/95
26.06.1995 JP 159428/95

(71)	Applicant: CANON KABUSHIKI KAISHA
	Tokyo (JP)

(72)	Inventor:
	Yagyu, Mineto, c/o Canon K.K. Tokyo (JP)

(74)	Representative: Beresford, Keith Denis Lewis et al
	BERESFORD & Co. 2-5 Warwick Court High Holborn London WC1R 5DJ London WC1R 5DJ (GB)

(54)	Optical modulation system for an image display

(57) An optical modulation unit is constituted by a light source periodically turned on, and an optical modulation means including an optical modulation element and periodically turned on. The optical modulation unit is driven by changing a voltage applied to the optical modulation element depending on given graduation data so as to modulate an overlapping time between an ON period of the optical modulation means and a lighting period of the light source. The gradation data may be analog gradation data and may be carried by light illuminating the optical modulation element synchronized with a voltage applied to the optical modulation element.

Search report